1221301522 has 64 divisors (see below), whose sum is σ = 2284402176. Its totient is φ = 477757440.

The previous prime is 1221301519. The next prime is 1221301537. The reversal of 1221301522 is 2251031221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221301522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2507563 + ... + 2508049.

It is an arithmetic number, because the mean of its divisors is an integer number (35693784).

Almost surely, 2^1221301522 is an apocalyptic number.

1221301522 is a deficient number, since it is larger than the sum of its proper divisors (1063100654).

1221301522 is a wasteful number, since it uses less digits than its factorization.

1221301522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1221301522 is about 34947.1246599774. The cubic root of 1221301522 is about 1068.9095718692.

Adding to 1221301522 its reverse (2251031221), we get a palindrome (3472332743).

The spelling of 1221301522 in words is "one billion, two hundred twenty-one million, three hundred one thousand, five hundred twenty-two".